Improvement in sewing-machines



1 3Sheets--Sheet1.

y(I. GULLMANN.

Sewing-Machines.

NO. 136,057. Patented Feb.18,1873.

fvl VA i Pf AM mami/mummia co, lv. xmseanwf's Pnaegssj :PATENT Or-Free f enrrsrorn euriiiymnn, rnrnnsor, snwnnessr.

. i 'Speciiication'formingpartof Letters Toll 'whom it may concern:

V- BeA itllcnownA that I, CHRISTOPH GULLMAN,

of Paterson, -in the county of V.Passaic fand State of New 1J ersey, have f invented a new anduseful Improvement inSewing-Machines;

inverted-'plan of-t-he same. "Fig. 3 is atrans- 'versefvertical section ofthe same taken in the plane indicated bythe line m w,`Fig. .1. Fig. 4 is a similar lsection in .the plane y y, Fig. 1. Fig. 5 is a sectionalfront view of the same. l Fig. 6`is. an elevation of the needle' bar and take-up mechanism. i Fig-'7 is a front view of thetension device in a larger scale than` the previous figures. Fig. 8. is a transverse vertical section of the same in the plane ze, Fig. 7. Fig. 9 is a detached sectional view of the needle-bar and needle in a larger scale thanthe previous iigures.

Similar letters indicate corresponding parts. This 1nvent1on consists in the combination of an eccentric and cam lever with the. lever thatserVes to impart motion to the needle-bar in sucha manner that .the motion of the needlelever is renderedeasy at every point, and'at the -same time the requisite changes in the motion of the needle are obtained; further, inv

theSarrangement of a lever which has a com-` poundoscillatinginotionj, and which carries the shuttle in such a mannerthat the shuttle in going backis moved below the point of the needle, while the saine in goingiorward passes throngh`the loop of the:n'e'edle-threadY in a i horizontal direction, and thereby theineedle is eifectually prevented from striking the shuttle, and the. thread of the shuttle-bobbinis held -tautso as to prevent the needle from catching Inthe drawing, the letter A designa-tes the doth-plated .my sewingina'chine, fromV which rises thef'arrn B that supports the guides C C for.tl ie;needle.barlD, and also theifulcrum-pn aofthe; needle-lever ,En This lever 'extends beyond :its fulcrnm, v(see .i Fi g. .1,)1 rmd to. its

.rear end :is :pivote-d aj fred, lF,': (best` seen ,in

Fig; 3;) nthat;extendsrdownthrough:the cavity A ,IMPROVEMENT insEwINe-MACHINES.

Paieiffnol 136,057, dated February is, 1era.

4 tofthearmB, and through a tubular' guide,

b, which is secured `between standards ed,

extending from the underside of the clothi plate. .The standard c forms the bearing rfor the rear portion of the main shaft G', and on this shaft is mounted an eccentric, e, embraced by a strap, f, from which extends alever, g, `providedwith a cam-slot, h. s This cam-slot catches over l two pivots, i j, the pivot i being firmly secured in the standards d d, -(see Figs.

1 Zand 3,) while the pivotj projects from the .rodFthat is connected to the needle-lever. lWhen the main shaft G isrevolved,;a co n1 pound motionis imparted to the lever-strap g, causing the same to slide and to `oscillate on its fulcrumpin t; and the cam-slot h in said strap is so shaped that the needle obtains the requisite motion to penetrate the fabric, recede to form the loop, remain stationary vto allow the shuttle to. passthroughrthe loop, and,

iinally, to rise again ready for the subsequent stitch.

By referring to F1g.3, it will be seen that,

during the entire stroke of the needle, the cani-slot h acts directly on the stud j, and the rod F is not subjected to lateral strain, so th at it requires `comparatively little power to keep my machine in motion. Y

v Eieretofore a cam-groove has been used to impart to the needle the requisite motion, and in some parts of its motion this cam-groove is the cause of a great waste of power, and of much wear of those parts of the machine which are in connection with said cam-groove or depend upon it for motion.

On the main shaft .G is mounted a second eccentric, Je, which is embraced by a strap, l, from which extends a lever, mf, (best seen in Fig. 4.) This lever isprovided with a curved slot, a, that straddles the pivot i., and in said lever is an opening, o, in which the `end of the shuttledriving lleverH enters. This shuttlc-lever is provided with a hub, p, having 'an opening large enough to pass freely over a stud, q, which extends from the'V under side ot' the cloth-plate. In said studl is an annular groove (see Fig. l) to receive the ends of two screws, fr o', Fig. 2, which extend through the direction.

rf: The construction Y this :l

universalr joint might, however, berchaxnged in various ways,J and I d'o not wish to confine:

shuttle-carrier in the position shown in Fig.V

6, causing the shuttle S to bear against the shuttle-race J. .When the shuttletcarrier is turned back on its. pivot in the direction of the arrow, shown near it in Fig. 6, the shuttle -can be readily taken out or inserted; but ifthevshuttle is in its working position the spring tallows the same to accommodate itself to the surface of. the shuttle-race during the motion ot' the shuttle-lever, and to prevent the shuttle from flying out. rlhe shuttle-race J forrnsthe segment ot aleircle described from the fulcrum of the shuttle-lever, or, i-n reality, it ought to form a section of the inner surface of a hollow globe described round said fulcrnm; andas the shuttle-lever passes through its evolutions the shuttle in going backV is depressed below the lowest point reached by the needle, and in going for' wardthe shuttle moves in a horizontal directionA through the loop ot' the needle-thread. By depressing the shuttle in going back all danger of the needle in its descent striking the shuttle is avoided, and at the saine time the shuttle-thread is kept taut, so that the needle is not liable to become entangled in the same. On the front end of the main shaft G is tormed an eccentric, u, (see Fig. 5,) which is embraced by a lever-strap, rv,\the upper end of which is connected by a pivot, w, with the feed-bar K. On this feed-bar is securedthe feed-dog a', and its end is bifurcated and made to straddle two pins, I2C/(see Figs. 2 and 5,).whch are secured inthe sides of a stud fastened-to the under side of the cloth-plate. The lever-strap e is provided with a slot, e', that catches over a pin, d', secured in a lever, e', which is attached to an arbor, f. .The piu d forms the fulcrum ofthe lever-strap v, and, by turning the arbor f', this fulcrum can be adjusted so as to regulate the motion impart-y ed to the feed-bar, and consequently the length of the stitches.- On the inner endv of the arbor j is mounted a lever, g', (see Figs. 1, 2, and 4,) which engages with a groove turned in a screw, h', that extends up through the cloth-plate. By turning this screw up or down the stitchesare decreased or increased, as may be desired. When the 'main shaft revolves the lever-strap 'v' assumes an osei1lating anda sliding motion on its pivot, and the feed-dog is successively. raised, vpushed for ward, depressed, and moved back. .The.nee.-

dlethread; which is taken trom thespoolL, is carried through the tension mechanism M,

thence through eyes 'to the -take-uplei'er N, and from this lever down Vto the needle.

The take-up Vlever swings on a pivot,j, se- 'cured'inthe side of thev arm B, Fig. 1, and it is subjected to the action of a spring, k', 4whichhas a .tendency to `carry the same up to its highest position. -In said takeup lever is a cam-opening, Z', which straddles. a pin, m,-

(see Fig. 6,) secured in the side of the needlebar, so that, as the needle-bar moves up and down, a-n oscillating motion is imparted to the take-uplever. AThe cam-opening in said take-up lever is of such a shape that, While the shuttle passes through the loop of' thefneedie-thread, the take-up lever has a certain play, allowing the same to recover the thread,

" which otherwise would become slack as the shuttle passes outof the needle-thread, while i said lever assumes a positive upward motion,

andl becomes irmly locked when the needle lhas reached its highest position, and, conse quently, every stitch is drawn, up tight ,with` a uniform force.

The tension mechanism consists o f two roll. ers, 'n' o', (see Figs. 7 and 8,) one of whichis mounted on a xed bearing, while the axisof Athe other is secured in a slide, p', whichgis, subjected to the action of av spring, q', and' screw r. By means of this spring andl screw the faces of the two rollers'can be pressed-up against each other, and if the needle-thread is wound round the lower roller o its tension is regulated by increasin g or decreasing the pressure of the two rollers against each other. To prevent the thread from running 0E from the roller o', I prefer to make the face of this roller concave and that of the other roller convex, as shown.

By referring` to Fig. 9 of the drawing it will he seen that the shank of the needle is set on' onpne side of its head r', so that the front of the needle is ush with the head, and if the needle is changed it will always retain its proper relation to the throat ot' the pressurefoot and to the shuttle-race.

If the shank of the needle is situated in the center of its head, and a coarse needle is introduced instead of a line one, or vice versa, the position of the point of the needle .in re lation to the throat and to the shuttle-race is changed, and the correct opera-tion of the sewing mechanism is disturbed.

What I claim as new, and desire to secureby Letters Patent, is

1. The combination of the slotted leverstrap g, operated by the eccentric e and s1iding on pin z', with the rod F, connected with the needle-bar E, and with the. strap, substantially as and for'the purpose described.

2. The horizontal shuttle-driving lever H, operated substantially as described, so that the shuttle travels in an elliptical orbit, pass' ing through the loop.clo`se up to thev .under side of tlxevclothiplate', and returning in a plane below that occupied bythe point :of .'the nece: die, thus holdingthe needlefthread: taut, subs stantially as set forth.

3f Theslrnttle-carier hinged` toe'rslinttlei .Thisspecigationlsigped bynle this 19th day leve,"v H, whel'mves on"af uiirersatlfjoint,` of December, 1872. said shuttle-carrier being subjected t0 @liege-4. y* tion of fa spring, l, which enables the shilttle contained in the carrier `to accommodateitself-to theshuttlewace during the evolu= tions of the shuttle-lever, substantially as described. f

CHRISTOPH GULLMANN.

4 `Witnesses: ,HAUFF u E. F. KASTENHUBER. 

